Filters the action links displayed for each site in the Sites list table.

The 'Edit', 'Dashboard', 'Delete', and 'Visit' links are displayed by
default for each site. The site's status determines whether to show the
'Activate' or 'Deactivate' link, 'Unarchive' or 'Archive' links, and
'Not Spam' or 'Spam' link for each site.